Path Analysis: A Critical Evaluation Using Long-Term Experimental Data

We evaluated the ability of path analysis to characterize direct and indirect interactions in a natural ecological system. Based on previous experimental work, we constructed a path diagram reflecting presumed relationships between kangaroo rats (Dipodomys spp.) and two other small rodent species. The technique was applied to examine the direct effects of competition and indirect effects mediated through vegetation. Path analysis gave varying and sometimes uninterpretable results when applied to data collected from unmanipulated and manipulated systems. The variation most likely can be attributed to some combination of inadequate specification of the path diagram, differences between unmanipulated and manipulated systems, varying responses to experiments of different duration, and natural temporal variation. Because these issues are applicable to many kinds of complex systems, we suggest caution before applying and when interpreting the results of path analysis.

[1]  Sewall Wright,et al.  Path coefficients and path regressions: Alternative or complementary concepts? , 1960 .

[2]  James H. Brown,et al.  Long‐Term Experimental Study of a Chihuahuan Desert Rodent Community: 13 Years of Competition , 1994 .

[3]  James H. Brown,et al.  Experimental Manipulation of a Desert Rodent Community: Food Addition and Species Removal , 1985 .

[4]  R. Mitchell.  Effects of Floral Traits, Pollinator Visitation, and Plant Size on Ipomopsis aggregata Fruit Production , 1994, The American Naturalist.

[5]  James H. Brown,et al.  Control of a Desert-Grassland Transition by a Keystone Rodent Guild , 1990, Science.

[6]  S. Strauss,et al.  Indirect effects in community ecology: Their definition, study and importance. , 1991, Trends in ecology & evolution.

[7]  Stephen R. Carpenter,et al.  Complex Interactions in Lake Communities , 2011, Springer New York.

[8]  S. J. Arnold,et al.  Animal Mating Systems: A Synthesis Based on Selection Theory , 1994, The American Naturalist.

[9]  Joel G. Kingsolver,et al.  Path analyses of selection. , 1991, Trends in ecology & evolution.

[10]  J. Timothy Wootton,et al.  PREDICTING DIRECT AND INDIRECT EFFECTS: AN INTEGRATED APPROACH USING EXPERIMENTS AND PATH ANALYSIS' , 1994 .

[11]  D. Roach.  Timing of Seed Production and Dispersal Geranium Carolinianum: Effects on Fitness , 1986 .

[12]  J. Elashoff,et al.  Multiple Regression in Behavioral Research. , 1975 .

[13]  J. Choate,et al.  Mammals of Arizona , 1989 .

[14]  Stephen R. Carpenter,et al.  Cascading Trophic Interactions and Lake Productivity , 1985 .

[15]  R. J. Schmitt.  Indirect Interactions Between Prey: Apparent Competition, Predator Aggregation, and Habitat Segregation. , 1987, Ecology.

[16]  B. Crespi.  Measuring the Effect of Natural Selection on Phenotypic Interaction Systems , 1990, The American Naturalist.

[17]  Leslie A. Hayduk.  Structural equation modeling with LISREL: essentials and advances , 1987 .

[18]  J. C. Munger,et al.  Competition in desert rodents: an experiment with semipermeable exclosures. , 1981, Science.

[19]  James H. Brown,et al.  Comparative Population Ecology of Eleven Species of Rodents in the Chihuahuan Desert , 1989 .

[20]  C. Horvitz,et al.  PLANT-ANIMAL INTERACTIONS AND FRUIT PRODUCTION IN A NEOTROPICAL HERB: A PATH ANALYSIS' , 1988 .

[21]  James H. Brown,et al.  Temporal changes in a Chihuahuan Desert rodent community , 1990 .

[22]  Ching Chun Li.  Path Analysis: A Primer , 1977 .

[23]  M. Lechowicz,et al.  Functional Interactions among Traits that Determine Reproductive Success in a Native Annual Plant , 1990 .

[24]  W. Armbruster,et al.  SPECIES DISTRIBUTION CONTROLS ACROSS A FOREST-STEPPE TRANSITION: A CAUSAL MODEL AND EXPERIMENTAL TEST' , 1991 .

[25]  M. Rosenzweig.  Habitat Selection Experiments with a Pair of Coexisting Heteromyid Rodent Species , 1973 .

[26]  M. Gilpin,et al.  Perturbation Experiments in Community Ecology: Theory and Practice , 1984 .

[27]  J. Timothy Wootton,et al.  Indirect Effects, Prey Susceptibility, and Habitat Selection: Impacts of Birds on Limpets and Algae , 1992 .

[28]  S. Wright.  The Method of Path Coefficients , 1934 .

[29]  D. A. Kenny,et al.  Correlation and Causation , 1937, Wilmott.

[30]  T. Mitchell-Olds.  Analysis of Local Variation in Plant Size , 1987 .

[31]  F. Bookstein,et al.  A PATH‐ANALYTIC MODEL FOR THE MEASUREMENT OF SELECTION ON MORPHOLOGY , 1989, Evolution; international journal of organic evolution.

[32]  David Tilman,et al.  Ecological Experimentation: Strengths and Conceptual Problems , 1989 .

[33]  S. J. Arnold.  Species Densities of Predators and Their Prey , 1972, The American Naturalist.

[34]  James H. Brown,et al.  Granivory in Desert Ecosystems , 1979 .